Andrea Abarca, (L) leads an aerobics class in Los Guidos de Desamparados, Costa Rica July 23, 2015. More than 300 women participated in a physical health program organized by Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. The National Nutrition Survey shows that the Costa Rican population has 62.4 percent of adult men who are obese, while among women the percentage was 77.3, according to local media. (Photo by Juan Carlos Ulate/Reuters)

A woman takes part in an aerobics class in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

Women take part in an aerobics class in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

Hazel Castillo leaves her home with her three children to an aerobics class in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

Andrea Abarca (R) congratulates Hazel Castillo after announcing that she lost 7 kilograms, before an aerobics class in Los Guidos de Desamparados July 23, 2015. Castillo lost 7 kilograms in six months while participating in the health program organized by Abarca, which aims to combat obesity and sedentary behavior in poor women living in a slum. (Photo by Juan Carlos Ulate/Reuters)

Women take part in an aerobics class in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

Hazel Castillo, takes part in an aerobics class next to her son Heiner Jaen, in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

The participants of an aerobics class poses for a picture in the Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

Hazel Castillo combs her daughter Tyra Jaen's hair, at home before going to an aerobics class in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)

Hazel Castillo walks with her children to an aerobics class in Los Guidos de Desamparados July 23, 2015. (Photo by Juan Carlos Ulate/Reuters)